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【多选题】
过氧化苯甲酰的危害（ ）。A.
肝脏病变和慢性中毒
B.
水解生成苯甲酸，造成苯累积中毒
C.
氧化维生素，可能导致维生素缺乏
D.
具有氧化性，氧化面粉中的有色物质
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【简答题】某工厂有A、B两种配件生产甲、乙两种产品，每生产一种甲产品使用4个A配件耗时1h，每生产一件乙产品使用4个B配件耗时2h，该厂每天最多可从配件厂获得16个A配件和12个B配件，按每天8h计算，若生产一件甲产品获利2万元，生产一件乙产品获利3万元，采用哪种生产安排利润最大？
【单选题】— Do you have anything _______ for this Saturday afternoon? — Not yet. [ ]
A.
to be planned
B.
to plan
C.
planning
D.
planned
【简答题】v. 供应,供给,提供 p_____________
【单选题】某工厂生产甲和乙两种产品，甲产品的日产量是乙产品的1.5倍。现工厂改进了乙产品的生术技术，在保证产量不变的前提下，其单件产品生产能耗降低了20%，而每日工厂生产甲和乙两种产品的总能耗降低了10%。则在改进后，甲、乙两种产品的单件生产能耗之比为?
A.
2：3
B.
3：4
C.
4：5
D.
.5：6
【单选题】We are not allowed _____ outdoors with some other children. [ ]
A.
playing
B.
to be playing
C.
to play
D.
be playing
【单选题】Wrought iron has an inherent resistance to corrosion but is not to be had freely , its place has been taken by the cuprous alloysAccording to the above sentence , which of the following statements is ...
A.
Wrought iron can resist liquids flow
B.
It is difficult to attain the wrought iron
C.
Wrought iron should be combined with cuprous alloys
D.
The cuprous alloys have mere disadvantages than wrought iron
【简答题】阅读理解。 Paper Plane to Be Dropped from Space For most people, it is enough to see their paper planes fly for a few feet. The Japanese, however, want to make a paper plane fly for 240 miles from space. T...
【简答题】某工厂有A、B两种配件生产甲、乙两种产品，每生产一件甲产品使用4个A配件耗时1h，每生产一件乙产品使用4个B配件耗时2h，该厂每天最多可从配件厂获得16个A配件和12个B配件，按每天8h计算，若生产一件甲产品获利2万元，生产一件甲产品获利2万元，生产一件乙产品获利3万元，采用哪种生产安排利润最大？
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